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#1 |
Registered User
Join Date: Aug 2002
Location: Waxahachie TX
Posts: 773
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134a a/c conversion
i have a factory a/c that hasnt worked in years lookin to get it fixed.my question is this does anyone make a conversion for these trucks as far as just all the right sized o-rings or what be nice to get a whole kit instead of chasing all the stuff down...?
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#2 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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I know this is NOT the proper way to do this but I have bought the larger adapter ($3) to allow me to add the new freon and had no problems.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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#3 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Classic Industries has the adapters, Ester oil, and o-rings for about $30. I bought it last month along with a new drier and compressor but have not had a chance to do the conversion yet.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#4 |
Registered User
Join Date: Aug 2002
Location: Muskogee, Oklahoma
Posts: 2,914
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This is just my opinion but I wouldnt do it. I converted mine to 134a and it didnt get nearly as cold as the R12 did. I know they make an R12 replacement and have heard it works well but I would steer clear of changing over to the 134A.
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#5 |
Registered User
Join Date: Apr 2003
Location: Oklahoma City
Posts: 605
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I do conversions all the time and have very little trouble with them. you do want to make sure you have enough air flow across the condensor since r 134 runs at higher head pressures. You just charge it with about 10% less. orings are the same across the board. any questions feel free to email me.
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2008 Ford FX2 Screw 1971 C10 project in shop now! 2004 Pontiac Grandam (wifes) 2000 Cavalier z24 (gas saver) |
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#6 |
Robert Olson Transport
![]() Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,293
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i remember hearing that you can do just what 70c10 did and its fine you dont have to change o rings etc just drain all the r 12 and stick in 134A
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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#7 |
Registered User
Join Date: Oct 2001
Location: Grapevine, Tx.
Posts: 2,142
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Project71
I have the original a/c system that has been changed over to R134a. I know that my system is working correctlyand is properly charged. It will freeze you when the temperature is cool out but when it is really hot it lacks a lot. How would you suggest to get more airflow across the condensor. I have the standard factory setup with the fan/clutch and shroud. Should I be running an electric fan setup? I have heard that putting a larger condesor will help, is this a good idea? An A/C technician stated that there is a valve that is designed to run the r12 systems that allows the compressor to cycle off too early and that this component should be changed to the newer style one designed for r134a when doing a conversion. It was something about letting the compressor run longer without cycling off. Maybe I should use more insulation inside the cab and doors. It would also be nice to find a blower fan that would move the air better than the original. Thank you in advance
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John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS |
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#8 |
Glowing since 1978
Join Date: Mar 2001
Location: Lusby,MD,USA
Posts: 532
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Hutch,
Even on a new install of an aftermarket A/C system they recommend a condenser fan. This can be wired to come on when the compressor cycles on and go off when the compressor is off. This should help maintain adequate heat transfer even when the vehicle isn't moving. They also strongly recommend maintaining the clutch driven original style engine fan and shroud. Just keep in mind that even properly operating systems have a temperature increase when the outside air temp increase or the vehicle is not in motion. Good luck and stay cool.
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66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 69 Chevy C20 Custom Camper |
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#9 |
Mike
Join Date: Jan 2003
Location: west chester pa
Posts: 2,474
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I converted my sub to 134.I added a fan to the condenser,it greatly improved the cooling.It keeps it cold on a hot day.And that is with all the heat that comes thru all those big windows.
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires |
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#10 |
Registered User
Join Date: May 2003
Posts: 8
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Re: 134a a/c conversion
I would change all of the hoses. You need to flush the condenser and evaporator. The oil in the compressor needs to be changed to POE. I'd use blue (neoprene) o-rings. You will need a new receiver/drier. If the compressor pulley has been without a belt they sometimes have corrosion which chews up belts. With this setup you can charge with R134a but are still able to go back to R12 if you're unhappy with the R134a performance. For R134a you might also need to adjust the POA/STV. On my truck I use R12.
Richard |
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#11 |
Registered User
Join Date: Apr 2003
Location: Oklahoma City
Posts: 605
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Hutch
If you can get a larger condensor that would work also,more area and more fins per inch will help keep it cool. but if you run an electric fan wire it so it gets hot with the a/c is switched on so it runs even if the compressor has cycled off, the fan will last longer not kick off and on all the time. i have performed a conversion on a dodge where i got a newer style expansion valve for the r-134 even though the truck never had it so it is possible they have something similar for our trucks.
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2008 Ford FX2 Screw 1971 C10 project in shop now! 2004 Pontiac Grandam (wifes) 2000 Cavalier z24 (gas saver) |
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#12 |
Registered User
![]() Join Date: Jan 2001
Location: Sabinal, Texas
Posts: 1,706
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To optimize the cooling using 134 in R-12 systems, get a larger, condenser and add a fan as suggested. 134 needs approx. 20% MORE condenser area than that of R-12 even though you use approx. 20% LESS refrigerant. The old POA system works well when replacing the orifice with a Ford blue tube. It is HIGHLY recommended to change out your old A/C hoses with new barrier type EPDM pieces. It will work well just make sure that the orig. mixing doors seal properly and the heater valve is operating properly as well. You can add a manual shut-off throttling valve in the heater line as well.
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